If you are seeing a white screen when you login to ACT, it is most likely being caused by a corrupted database or your PHP version is not supported.

If you have call data on your installation, you'll need to make a backup of the database, and then re-upload the calltrack.sql file in your phpMyAdmin. 

If you don't have any call data, and this is a fresh install, you can simply delete the database you setup during installation, and create a new one with a fresh calltrack.sql file. 

Also, please check your php version to be setup at 5.4/5.6 since this is what we currently recommend for ACT.

This should take care of the blank white screen issue you see after logging in.

If you are still having problems, please submit a ticket at https://support.web1.co